# Thread: Anyone good with physics?

1. ## Anyone good with physics?

I'm having some trouble understanding a lot of the concepts the teacher has given (because he's kind of weird)

2. Search it on google. I have not taken physics yet, but I heard its a real pain in the ass, lol.

3. What are the concepts?

4. Originally Posted by Dan
Search it on google. I have not taken physics yet, but I heard its a real pain in the ass, lol.
Didn't explain it very welll

---------- Post added at 09:43 PM ---------- Previous post was at 09:42 PM ----------

Originally Posted by zakeryp
What are the concepts?
Trying to interpret acceleration/velocity/position, just not understanding acceleration->velocity at this point

5. Any specific questions?
And physics is fun, people say its hard but I find it easier than biology and chemistry.
Acceleration is the change in velocity over time, just like how velocity is the change in position over time.

6. i can give it a shot if you want.

7. First you need to better understand what velocity, speed, acceleration, and deceleration mean in terms of physics. Laws of physics are most simply written in terms of velocity, not speed.

Physics uses a technical definition of acceleration that conflicts with ordinary views of the said word as well as with deceleration. In physics, acceleration refers to a change in velocity(per unit of time), not speed. In the normal everyday speech, acceleration commonly means speeding up, i.e. an increase in speed.

In physics, the word deceleration is not really used. Most people would believe it to be the opposite of acceleration, or the negative of acceleration; this is false. Any change in velocity is called an acceleration. Normally deceleration most commonly means slowing down, i.e. a decrease in speed.

In physics speed can be looked at as the rate an object covers a distance.

In physics acceleration is a Vector Quantity and speed is a Scalar quantity.

Scalars are quantities that are fully described by a magnitude (or numerical value) alone.
Vectors are quantities that are fully described by both a magnitude and a direction.

Remember when evaluating velocity you also need to keep in mind direction. In accordance to velocity it is not enough to state that an object has a velocity of X mi/hr. One must include directional information in order to fully describe the velocity of the object. For instance, you must describe an object's velocity as being X mi/hr, east. This is one of the essential differences between speed and velocity. Speed is a scalar quantity and does not keep track of direction; velocity is a vector quantity and is direction aware.

Anymore? or need further explaining of the above?

8. zakeryp summed it up nicely. Also kinematics equations:

These equations relate different quantities such as velocity, displacement, acceleration, and time.

9. ## The Following User Says Thank You to bamag For This Useful Post:

zakeryp (02-02-2012)

10. Originally Posted by bamag
zakeryp summed it up nicely. Also kinematics equations:

These equations relate different quantities such as velocity, displacement, acceleration, and time.
v = velocity
vi= initial Velocity
vf= Final Velocity
a= acceleration
t= time
d = displacemt

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